include/drm/drm_dsc.h

   1 /* SPDX-License-Identifier: MIT
   2  * Copyright (C) 2018 Intel Corp.
   3  *
   4  * Authors:
   5  * Manasi Navare <manasi.d.navare@intel.com>
   6  */
   7
   8 #ifndef DRM_DSC_H_
   9 #define DRM_DSC_H_
  10
  11 #include <drm/drm_dp_helper.h>
  12
  13 /* VESA Display Stream Compression DSC 1.2 constants */
  14 #define DSC_NUM_BUF_RANGES                      15
  15 #define DSC_MUX_WORD_SIZE_8_10_BPC              48
  16 #define DSC_MUX_WORD_SIZE_12_BPC                64
  17 #define DSC_RC_PIXELS_PER_GROUP                 3
  18 #define DSC_SCALE_DECREMENT_INTERVAL_MAX        4095
  19 #define DSC_RANGE_BPG_OFFSET_MASK               0x3f
  20
  21 /* DSC Rate Control Constants */
  22 #define DSC_RC_MODEL_SIZE_CONST             8192
  23 #define DSC_RC_EDGE_FACTOR_CONST            6
  24 #define DSC_RC_TGT_OFFSET_HI_CONST          3
  25 #define DSC_RC_TGT_OFFSET_LO_CONST          3
  26
  27 /* DSC PPS constants and macros */
  28 #define DSC_PPS_VERSION_MAJOR_SHIFT             4
  29 #define DSC_PPS_BPC_SHIFT                       4
  30 #define DSC_PPS_MSB_SHIFT                       8
  31 #define DSC_PPS_LSB_MASK                        (0xFF << 0)
  32 #define DSC_PPS_BPP_HIGH_MASK                   (0x3 << 8)
  33 #define DSC_PPS_VBR_EN_SHIFT                    2
  34 #define DSC_PPS_SIMPLE422_SHIFT                 3
  35 #define DSC_PPS_CONVERT_RGB_SHIFT               4
  36 #define DSC_PPS_BLOCK_PRED_EN_SHIFT             5
  37 #define DSC_PPS_INIT_XMIT_DELAY_HIGH_MASK       (0x3 << 8)
  38 #define DSC_PPS_SCALE_DEC_INT_HIGH_MASK         (0xF << 8)
  39 #define DSC_PPS_RC_TGT_OFFSET_HI_SHIFT          4
  40 #define DSC_PPS_RC_RANGE_MINQP_SHIFT            11
  41 #define DSC_PPS_RC_RANGE_MAXQP_SHIFT            6
  42 #define DSC_PPS_NATIVE_420_SHIFT                1
  43 #define DSC_1_2_MAX_LINEBUF_DEPTH_BITS          16
  44 #define DSC_1_2_MAX_LINEBUF_DEPTH_VAL           0
  45 #define DSC_1_1_MAX_LINEBUF_DEPTH_BITS          13
  46
  47 /* Configuration for a single Rate Control model range */
  48 struct drm_dsc_rc_range_parameters {
  49         /* Min Quantization Parameters allowed for this range */
  50         u8 range_min_qp;
  51         /* Max Quantization Parameters allowed for this range */
  52         u8 range_max_qp;
  53         /* Bits/group offset to apply to target for this group */
  54         u8 range_bpg_offset;
  55 };
  56
  57 struct drm_dsc_config {
  58         /* Bits / component for previous reconstructed line buffer */
  59         u8 line_buf_depth;
  60         /* Bits per component to code (must be 8, 10, or 12) */
  61         u8 bits_per_component;
  62         /*
  63          * Flag indicating to do RGB - YCoCg conversion
  64          * and back (should be 1 for RGB input)
  65          */
  66         bool convert_rgb;
  67         u8 slice_count;
  68         /* Slice Width */
  69         u16 slice_width;
  70         /* Slice Height */
  71         u16 slice_height;
  72         /*
  73          * 4:2:2 enable mode (from PPS, 4:2:2 conversion happens
  74          * outside of DSC encode/decode algorithm)
  75          */
  76         bool enable422;
  77         /* Picture Width */
  78         u16 pic_width;
  79         /* Picture Height */
  80         u16 pic_height;
  81         /* Offset to bits/group used by RC to determine QP adjustment */
  82         u8 rc_tgt_offset_high;
  83         /* Offset to bits/group used by RC to determine QP adjustment */
  84         u8 rc_tgt_offset_low;
  85         /* Bits/pixel target << 4 (ie., 4 fractional bits) */
  86         u16 bits_per_pixel;
  87         /*
  88          * Factor to determine if an edge is present based
  89          * on the bits produced
  90          */
  91         u8 rc_edge_factor;
  92         /* Slow down incrementing once the range reaches this value */
  93         u8 rc_quant_incr_limit1;
  94         /* Slow down incrementing once the range reaches this value */
  95         u8 rc_quant_incr_limit0;
  96         /* Number of pixels to delay the initial transmission */
  97         u16 initial_xmit_delay;
  98         /* Number of pixels to delay the VLD on the decoder,not including SSM */
  99         u16  initial_dec_delay;
 100         /* Block prediction enable */
 101         bool block_pred_enable;
 102         /* Bits/group offset to use for first line of the slice */
 103         u8 first_line_bpg_offset;
 104         /* Value to use for RC model offset at slice start */
 105         u16 initial_offset;
 106         /* Thresholds defining each of the buffer ranges */
 107         u16 rc_buf_thresh[DSC_NUM_BUF_RANGES - 1];
 108         /* Parameters for each of the RC ranges */
 109         struct drm_dsc_rc_range_parameters rc_range_params[DSC_NUM_BUF_RANGES];
 110         /* Total size of RC model */
 111         u16 rc_model_size;
 112         /* Minimum QP where flatness information is sent */
 113         u8 flatness_min_qp;
 114         /* Maximum QP where flatness information is sent */
 115         u8 flatness_max_qp;
 116         /* Initial value for scale factor */
 117         u8 initial_scale_value;
 118         /* Decrement scale factor every scale_decrement_interval groups */
 119         u16 scale_decrement_interval;
 120         /* Increment scale factor every scale_increment_interval groups */
 121         u16 scale_increment_interval;
 122         /* Non-first line BPG offset to use */
 123         u16 nfl_bpg_offset;
 124         /* BPG offset used to enforce slice bit */
 125         u16 slice_bpg_offset;
 126         /* Final RC linear transformation offset value */
 127         u16 final_offset;
 128         /* Enable on-off VBR (ie., disable stuffing bits) */
 129         bool vbr_enable;
 130         /* Mux word size (in bits) for SSM mode */
 131         u8 mux_word_size;
 132         /*
 133          * The (max) size in bytes of the "chunks" that are
 134          * used in slice multiplexing
 135          */
 136         u16 slice_chunk_size;
 137         /* Rate Control buffer siz in bits */
 138         u16 rc_bits;
 139         /* DSC Minor Version */
 140         u8 dsc_version_minor;
 141         /* DSC Major version */
 142         u8 dsc_version_major;
 143         /* Native 4:2:2 support */
 144         bool native_422;
 145         /* Native 4:2:0 support */
 146         bool native_420;
 147         /* Additional bits/grp for seconnd line of slice for native 4:2:0 */
 148         u8 second_line_bpg_offset;
 149         /* Num of bits deallocated for each grp that is not in second line of slice */
 150         u16 nsl_bpg_offset;
 151         /* Offset adj fr second line in Native 4:2:0 mode */
 152         u16 second_line_offset_adj;
 153 };
 154
 155 /**
 156  * struct picture_parameter_set - Represents 128 bytes of Picture Parameter Set
 157  *
 158  * The VESA DSC standard defines picture parameter set (PPS) which display
 159  * stream compression encoders must communicate to decoders.
 160  * The PPS is encapsulated in 128 bytes (PPS 0 through PPS 127). The fields in
 161  * this structure are as per Table 4.1 in Vesa DSC specification v1.1/v1.2.
 162  * The PPS fields that span over more than a byte should be stored in Big Endian
 163  * format.
 164  */
 165 struct drm_dsc_picture_parameter_set {
 166         /**
 167          * @dsc_version:
 168          * PPS0[3:0] - dsc_version_minor: Contains Minor version of DSC
 169          * PPS0[7:4] - dsc_version_major: Contains major version of DSC
 170          */
 171         u8 dsc_version;
 172         /**
 173          * @pps_identifier:
 174          * PPS1[7:0] - Application specific identifier that can be
 175          * used to differentiate between different PPS tables.
 176          */
 177         u8 pps_identifier;
 178         /**
 179          * @pps_reserved:
 180          * PPS2[7:0]- RESERVED Byte
 181          */
 182         u8 pps_reserved;
 183         /**
 184          * @pps_3:
 185          * PPS3[3:0] - linebuf_depth: Contains linebuffer bit depth used to
 186          * generate the bitstream. (0x0 - 16 bits for DSC 1.2, 0x8 - 8 bits,
 187          * 0xA - 10 bits, 0xB - 11 bits, 0xC - 12 bits, 0xD - 13 bits,
 188          * 0xE - 14 bits for DSC1.2, 0xF - 14 bits for DSC 1.2.
 189          * PPS3[7:4] - bits_per_component: Bits per component for the original
 190          * pixels of the encoded picture.
 191          * 0x0 = 16bpc (allowed only when dsc_version_minor = 0x2)
 192          * 0x8 = 8bpc, 0xA = 10bpc, 0xC = 12bpc, 0xE = 14bpc (also
 193          * allowed only when dsc_minor_version = 0x2)
 194          */
 195         u8 pps_3;
 196         /**
 197          * @pps_4:
 198          * PPS4[1:0] -These are the most significant 2 bits of
 199          * compressed BPP bits_per_pixel[9:0] syntax element.
 200          * PPS4[2] - vbr_enable: 0 = VBR disabled, 1 = VBR enabled
 201          * PPS4[3] - simple_422: Indicates if decoder drops samples to
 202          * reconstruct the 4:2:2 picture.
 203          * PPS4[4] - Convert_rgb: Indicates if DSC color space conversion is
 204          * active.
 205          * PPS4[5] - blobk_pred_enable: Indicates if BP is used to code any
 206          * groups in picture
 207          * PPS4[7:6] - Reseved bits
 208          */
 209         u8 pps_4;
 210         /**
 211          * @bits_per_pixel_low:
 212          * PPS5[7:0] - This indicates the lower significant 8 bits of
 213          * the compressed BPP bits_per_pixel[9:0] element.
 214          */
 215         u8 bits_per_pixel_low;
 216         /**
 217          * @pic_height:
 218          * PPS6[7:0], PPS7[7:0] -pic_height: Specifies the number of pixel rows
 219          * within the raster.
 220          */
 221         __be16 pic_height;
 222         /**
 223          * @pic_width:
 224          * PPS8[7:0], PPS9[7:0] - pic_width: Number of pixel columns within
 225          * the raster.
 226          */
 227         __be16 pic_width;
 228         /**
 229          * @slice_height:
 230          * PPS10[7:0], PPS11[7:0] - Slice height in units of pixels.
 231          */
 232         __be16 slice_height;
 233         /**
 234          * @slice_width:
 235          * PPS12[7:0], PPS13[7:0] - Slice width in terms of pixels.
 236          */
 237         __be16 slice_width;
 238         /**
 239          * @chunk_size:
 240          * PPS14[7:0], PPS15[7:0] - Size in units of bytes of the chunks
 241          * that are used for slice multiplexing.
 242          */
 243         __be16 chunk_size;
 244         /**
 245          * @initial_xmit_delay_high:
 246          * PPS16[1:0] - Most Significant two bits of initial transmission delay.
 247          * It specifies the number of pixel times that the encoder waits before
 248          * transmitting data from its rate buffer.
 249          * PPS16[7:2] - Reserved
 250          */
 251         u8 initial_xmit_delay_high;
 252         /**
 253          * @initial_xmit_delay_low:
 254          * PPS17[7:0] - Least significant 8 bits of initial transmission delay.
 255          */
 256         u8 initial_xmit_delay_low;
 257         /**
 258          * @initial_dec_delay:
 259          *
 260          * PPS18[7:0], PPS19[7:0] - Initial decoding delay which is the number
 261          * of pixel times that the decoder accumulates data in its rate buffer
 262          * before starting to decode and output pixels.
 263          */
 264         __be16 initial_dec_delay;
 265         /**
 266          * @pps20_reserved:
 267          *
 268          * PPS20[7:0] - Reserved
 269          */
 270         u8 pps20_reserved;
 271         /**
 272          * @initial_scale_value:
 273          * PPS21[5:0] - Initial rcXformScale factor used at beginning
 274          * of a slice.
 275          * PPS21[7:6] - Reserved
 276          */
 277         u8 initial_scale_value;
 278         /**
 279          * @scale_increment_interval:
 280          * PPS22[7:0], PPS23[7:0] - Number of group times between incrementing
 281          * the rcXformScale factor at end of a slice.
 282          */
 283         __be16 scale_increment_interval;
 284         /**
 285          * @scale_decrement_interval_high:
 286          * PPS24[3:0] - Higher 4 bits indicating number of group times between
 287          * decrementing the rcXformScale factor at beginning of a slice.
 288          * PPS24[7:4] - Reserved
 289          */
 290         u8 scale_decrement_interval_high;
 291         /**
 292          * @scale_decrement_interval_low:
 293          * PPS25[7:0] - Lower 8 bits of scale decrement interval
 294          */
 295         u8 scale_decrement_interval_low;
 296         /**
 297          * @pps26_reserved:
 298          * PPS26[7:0]
 299          */
 300         u8 pps26_reserved;
 301         /**
 302          * @first_line_bpg_offset:
 303          * PPS27[4:0] - Number of additional bits that are allocated
 304          * for each group on first line of a slice.
 305          * PPS27[7:5] - Reserved
 306          */
 307         u8 first_line_bpg_offset;
 308         /**
 309          * @nfl_bpg_offset:
 310          * PPS28[7:0], PPS29[7:0] - Number of bits including frac bits
 311          * deallocated for each group for groups after the first line of slice.
 312          */
 313         __be16 nfl_bpg_offset;
 314         /**
 315          * @slice_bpg_offset:
 316          * PPS30, PPS31[7:0] - Number of bits that are deallocated for each
 317          * group to enforce the slice constraint.
 318          */
 319         __be16 slice_bpg_offset;
 320         /**
 321          * @initial_offset:
 322          * PPS32,33[7:0] - Initial value for rcXformOffset
 323          */
 324         __be16 initial_offset;
 325         /**
 326          * @final_offset:
 327          * PPS34,35[7:0] - Maximum end-of-slice value for rcXformOffset
 328          */
 329         __be16 final_offset;
 330         /**
 331          * @flatness_min_qp:
 332          * PPS36[4:0] - Minimum QP at which flatness is signaled and
 333          * flatness QP adjustment is made.
 334          * PPS36[7:5] - Reserved
 335          */
 336         u8 flatness_min_qp;
 337         /**
 338          * @flatness_max_qp:
 339          * PPS37[4:0] - Max QP at which flatness is signalled and
 340          * the flatness adjustment is made.
 341          * PPS37[7:5] - Reserved
 342          */
 343         u8 flatness_max_qp;
 344         /**
 345          * @rc_model_size:
 346          * PPS38,39[7:0] - Number of bits within RC Model.
 347          */
 348         __be16 rc_model_size;
 349         /**
 350          * @rc_edge_factor:
 351          * PPS40[3:0] - Ratio of current activity vs, previous
 352          * activity to determine presence of edge.
 353          * PPS40[7:4] - Reserved
 354          */
 355         u8 rc_edge_factor;
 356         /**
 357          * @rc_quant_incr_limit0:
 358          * PPS41[4:0] - QP threshold used in short term RC
 359          * PPS41[7:5] - Reserved
 360          */
 361         u8 rc_quant_incr_limit0;
 362         /**
 363          * @rc_quant_incr_limit1:
 364          * PPS42[4:0] - QP threshold used in short term RC
 365          * PPS42[7:5] - Reserved
 366          */
 367         u8 rc_quant_incr_limit1;
 368         /**
 369          * @rc_tgt_offset:
 370          * PPS43[3:0] - Lower end of the variability range around the target
 371          * bits per group that is allowed by short term RC.
 372          * PPS43[7:4]- Upper end of the variability range around the target
 373          * bits per group that i allowed by short term rc.
 374          */
 375         u8 rc_tgt_offset;
 376         /**
 377          * @rc_buf_thresh:
 378          * PPS44[7:0] - PPS57[7:0] - Specifies the thresholds in RC model for
 379          * the 15 ranges defined by 14 thresholds.
 380          */
 381         u8 rc_buf_thresh[DSC_NUM_BUF_RANGES - 1];
 382         /**
 383          * @rc_range_parameters:
 384          * PPS58[7:0] - PPS87[7:0]
 385          * Parameters that correspond to each of the 15 ranges.
 386          */
 387         __be16 rc_range_parameters[DSC_NUM_BUF_RANGES];
 388         /**
 389          * @native_422_420:
 390          * PPS88[0] - 0 = Native 4:2:2 not used
 391          * 1 = Native 4:2:2 used
 392          * PPS88[1] - 0 = Native 4:2:0 not use
 393          * 1 = Native 4:2:0 used
 394          * PPS88[7:2] - Reserved 6 bits
 395          */
 396         u8 native_422_420;
 397         /**
 398          * @second_line_bpg_offset:
 399          * PPS89[4:0] - Additional bits/group budget for the
 400          * second line of a slice in Native 4:2:0 mode.
 401          * Set to 0 if DSC minor version is 1 or native420 is 0.
 402          * PPS89[7:5] - Reserved
 403          */
 404         u8 second_line_bpg_offset;
 405         /**
 406          * @nsl_bpg_offset:
 407          * PPS90[7:0], PPS91[7:0] - Number of bits that are deallocated
 408          * for each group that is not in the second line of a slice.
 409          */
 410         __be16 nsl_bpg_offset;
 411         /**
 412          * @second_line_offset_adj:
 413          * PPS92[7:0], PPS93[7:0] - Used as offset adjustment for the second
 414          * line in Native 4:2:0 mode.
 415          */
 416         __be16 second_line_offset_adj;
 417         /**
 418          * @pps_long_94_reserved:
 419          * PPS 94, 95, 96, 97 - Reserved
 420          */
 421         u32 pps_long_94_reserved;
 422         /**
 423          * @pps_long_98_reserved:
 424          * PPS 98, 99, 100, 101 - Reserved
 425          */
 426         u32 pps_long_98_reserved;
 427         /**
 428          * @pps_long_102_reserved:
 429          * PPS 102, 103, 104, 105 - Reserved
 430          */
 431         u32 pps_long_102_reserved;
 432         /**
 433          * @pps_long_106_reserved:
 434          * PPS 106, 107, 108, 109 - reserved
 435          */
 436         u32 pps_long_106_reserved;
 437         /**
 438          * @pps_long_110_reserved:
 439          * PPS 110, 111, 112, 113 - reserved
 440          */
 441         u32 pps_long_110_reserved;
 442         /**
 443          * @pps_long_114_reserved:
 444          * PPS 114 - 117 - reserved
 445          */
 446         u32 pps_long_114_reserved;
 447         /**
 448          * @pps_long_118_reserved:
 449          * PPS 118 - 121 - reserved
 450          */
 451         u32 pps_long_118_reserved;
 452         /**
 453          * @pps_long_122_reserved:
 454          * PPS 122- 125 - reserved
 455          */
 456         u32 pps_long_122_reserved;
 457         /**
 458          * @pps_short_126_reserved:
 459          * PPS 126, 127 - reserved
 460          */
 461         __be16 pps_short_126_reserved;
 462 } __packed;
 463
 464 /**
 465  * struct drm_dsc_pps_infoframe - DSC infoframe carrying the Picture Parameter
 466  * Set Metadata
 467  *
 468  * This structure represents the DSC PPS infoframe required to send the Picture
 469  * Parameter Set metadata required before enabling VESA Display Stream
 470  * Compression. This is based on the DP Secondary Data Packet structure and
 471  * comprises of SDP Header as defined in drm_dp_helper.h and PPS payload.
 472  *
 473  * @pps_header: Header for PPS as per DP SDP header format
 474  * @pps_payload: PPS payload fields as per DSC specification Table 4-1
 475  */
 476 struct drm_dsc_pps_infoframe {
 477         struct dp_sdp_header pps_header;
 478         struct drm_dsc_picture_parameter_set pps_payload;
 479 } __packed;
 480
 481 void drm_dsc_dp_pps_header_init(struct drm_dsc_pps_infoframe *pps_sdp);
 482 void drm_dsc_pps_infoframe_pack(struct drm_dsc_pps_infoframe *pps_sdp,
 483                                 const struct drm_dsc_config *dsc_cfg);
 484
 485 #endif /* _DRM_DSC_H_ */